severe vomiting accompanied by mild gait imbalance).Ībout 18% of all ischaemic strokes aff ect the posterior circulation, and about 50–70% gait imbalance or vomiting) may be excessively intensive compared to the others Symptom onset is typicallyĪbrupt in dizziness or vertigo related to cerebrovascular causes, and some complaints In all cases, urgent referral to the emergency department (ED), ideally followedīy further treatment in a specialized stroke unit, is essential. Prolonged complaints (as in stroke) and to identify accompanying neurological The prevalence of this variation as reported in the literature is about 20% to 24%Īnterior Inferior Cerebellar Artery Anomalies.Īnterior inferior cerebellar artery aneurysmĪnterior inferior cerebellar artery aneurysm.Īnterior inferior cerebellar artery infarctĪnterior inferior cerebellar artery infarct.Cerebrovascular disorders may result in dizziness or vertigo by various mechanisms.Īgain, history taking is essential to distinguish transient symptoms (as in TIA) from In this case of the agenesis of the posterior inferior cerebellar arteries, there will be a well-developed anterior inferior cerebellar artery with the posterior inferior cerebellar arteries arising from an anterior inferior cerebellar artery/posterior inferior cerebellar arteries common trunk. The agenesis of the posterior inferior cerebellar arteries may create an inverse relationship between the anterior inferior cerebellar artery and posterior inferior cerebellar arteries.

Other common variations that occur in the branches of the basilar artery that may affect the anterior inferior cerebellar artery are the agenesis of the right posterior inferior cerebellar arteries or the left posterior inferior cerebellar arteries. Some anastomoses have also been noted between the rostral part of the anterior inferior cerebellar artery and the superior cerebellar artery (SCA) and between the caudal part of the anterior inferior cerebellar artery and the posterior inferior cerebellar arteries. The double origin anterior inferior cerebellar artery has also been pointed out in the right anterior inferior cerebellar artery in which one branch originates from the basilar artery and the other from the vertebral artery. Duplication of the anterior inferior cerebellar artery has also been noted but is rare. In this variation, the anterior inferior cerebellar artery will either originate from a common trunk of the vertebral artery or the posterior inferior cerebellar arteries directly.

The most common variation noted is the presence no anterior inferior cerebellar artery, with its absence more common on the left side. The anterior inferior cerebellar artery has also been cited to give rise to the labyrinthine artery in about 90% of individuals. It may also stem from the vertebrobasilar junction as seen in about 9% of cases. In about 99% of patients, the anterior inferior cerebellar artery arises from the basilar artery with about 75% of cases originating from the lower third. The anterior inferior cerebellar artery also supplies the lower lateral pons, the choroid plexus of the lateral ventricle, the middle cerebellar peduncle and the inferior anterior area of the cerebellum. The anterior inferior cerebellar artery gives rise to the labyrinthine arteries which supply the vestibulocochlear and facial nerves. It also gives off the labyrinthine artery in most cases however, the labyrinthine artery can emerge as a branch of the basilar artery in others.ĪICA: Anterior inferior cerebellar artery C: Cerebellum PB: Petrosal part of the temporal bone SPV: Superior petrosal vein SMT: Suprameatal tubercle T: Tentorium V*: Motor roots of the trigeminal nerve. It supplies the anterior inferior quarter of the cerebellum. Left side: AE: arcuate eminence AICA: anteroinferior cerebellar artery JB: jugular bulb SC: semicircular canals SCA: superior cerebellar artery SPV: superior petrosal vein SS: sigmoid sinus VA: vertebral artery. It passes backward to be distributed to the anterior part of the undersurface of the cerebellum, anastomosing with the posterior inferior cerebellar branch of the vertebral artery.Īnterior inferior cerebellar artery segments.Īnterior inferior cerebellar artery branches. Often gives off a loop that runs into the IAC and gives off the labyrinthine artery and then emerges to supply the anterolateral inferior cerebellum and then anastomoses with PICA. It arises from the lower part of the basilar artery at the level of the junction between the medulla oblongata and the pons in the brainstem. The AICA lies near the surface of a vestibular schwannoma. Anterior inferior cerebellar artery (AICA)Īrtery in the brain that supplies part of the cerebellum.

Aica and pica syndrome